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TIL in 2009 archaeologists unearthed the oldest musical instruments ever found – flutes that inhabitants of southwestern Germany laboriously carved from bone and ivory at least 35,000 years ago.

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Wk7X9 TIL despite a 1998 GAO poll for the upcoming $1 coin warning that 65% of the public preferred the Statue of Liberty design and 27% preferred Sacagawea, the U.S. Mint decided to open a competition for the Sacagawea design. The coin was ultimately rejected by the public.
v1WXK Flying a helicopter on Mars is so damn hard but NASA made it possible. For the first flight, the helicopter took off, climbed to about 10 feet (3 meters) above the ground, hovered in the air briefly, completed a turn, and then landed. It was a major milestone: the very first powered flight in the extremely thin atmosphere of Mars, and, in fact, the first such flight in any world beyond Earth. Being able to fly a helicopter or drone on Mars is very important as they can cover 24 kilometers in an hour. By the way, Curiosity took nine years to travel less than 25 kilometers.
9wO86 TIL that Oppenheimer wrote out a will that left his estate to the University of California to be used for graduate scholarships.
oBD4W TIL that Hitler was an avid coprophiliac
WAA9 TIL that the Germans invented an infared scope during WWII. A 13-kilogram battery pack was worn on the back, and the scope could be used for 15 minutes at a time. It was codenamed “Vampir”